Machine Kinematics

Mechanism

Question 1
Marks : +2 | -2
Pass Ratio : 100%
Whitworth quick return motion mechanism consists of three turning pairs and one sliding pair.
True
False
Explanation:
Whitworth quick return motion mechanism is a form of single slider crank chain and it consists of one sliding pair and three turning pairs.
Question 2
Marks : +2 | -2
Pass Ratio : 100%
A type-writer constitutes a machine.
True
False
Explanation:
When a mechanism is required to transmit power or to do some particular type of work, it then becomes a machine.But in case of a typewriter there is no case of power transmission. Hence it is not a machine.
Question 3
Marks : +2 | -2
Pass Ratio : 100%
In a four bar chain or quadric cycle chain
each of the four pairs is a turning pair
one is a turning pair and three are sliding pairs
two are turning pairs and two are sliding pairs
three are turning pairs and one is a sliding pair
Explanation:
Four bar chain or quadric cycle chain consists of four links, each of them forms a turning pair.
Question 4
Marks : +2 | -2
Pass Ratio : 100%
The mechanism forms a structure, when the number of degrees of freedom (n) is equal to
0
1
2
-1
Explanation:
A structure can be formed only when the number of degrees of freedom is zero.
Question 5
Marks : +2 | -2
Pass Ratio : 100%
The mechanism in which two are turning pairs and two are sliding pairs, is called a
elliptical trammel
scotch yoke mechanism
oldham’s coupling
all of the mentioned
Explanation:
A double slider crank chain consists of two sliding pairs and two turning pairs. The inversions of a double slider crank chain are as follows:
Question 6
Marks : +2 | -2
Pass Ratio : 100%
A kinematic chain is known as a mechanism when
none of the links is fixed
one of the links is fixed
two of the links are fixed
none of the mentioned
Explanation:
When one of the links of a kinematic chain is fixed, the chain is known as mechanism.
Question 7
Marks : +2 | -2
Pass Ratio : 100%
Whitworth quick return motion mechanism is an inversion of a double slider crank chain.
True
False
Explanation:
Whitworth quick return motion mechanism is a form of single slider crank chain and it consists of one sliding pair and three turning pairs.
Question 8
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is an inversion of a single slider crank chain?
Pendulum pump or Bull engine
Rotary internal combustion engine
Oscillating cylinder engine
Crank and slotted lever quick return motion mechanism
Explanation:
All the mechanisms mentioned above are forms of single slider crank chain only and hence, they all contain three turning pairs and one sliding pair. The inversion of a single slider crank chain are found in the following mechanism:
Question 9
Marks : +2 | -2
Pass Ratio : 100%
Which of the following is an inversion of a double slider crank chain?
elliptical trammel
scotch yoke mechanism
oldham’s coupling.
All of the mentioned
Explanation:
A double slider crank chain consists of two sliding pairs and two turning pairs. The inversions of a double slider crank chain are as follows:
Question 10
Marks : +2 | -2
Pass Ratio : 100%
In a coupling rod of a locomotive, each of the four pairs is a _____________ pair.
sliding
turning
rolling
screw
Explanation:
In a locomotive, one rod of the coupling rod can only turn or revolve about a fixed axis of another rod. This takes place only in case of turning pair.